Hot air stove



Dec. 8, 1942. B. A. PoLLocK HOT AIR STOVE Filed NOV. 30, 1940 Sme/who@ .5er/zand PO ZOC/ .I In.. lnllllllllllllllllll lllllllxlllllllllllIlllllllzi Aa top plate I. tially square in horizontal cross section although 2 Patented Dee. 8, 1942 UNITED STATES PATENT OFFICE i I 2,304,707 c Y HOT AIR STOVE Bernarda. Pollock, Petersburg,- Va. Application November 30, 1940, Serial No. 388,087

s claims; (ci. 12s-93) This invention relates to a hot air stove and has relation more lparticularly to a stove burning a liquid fuel such as coal-oil.

It is an object of the invention to provide a stove of this kind with means whereby an increased heating capacity is obtained by providing means whereby air may pass upwardly through the stove at the center thereof and whereby such air is subjected to an intense'heat.

The invention consists in thedetails of construction and in the combination and arrangement of the several parts of my improved hot air stove whereby certain important advantages are attained and the device rendered simpler, less expensive and otherwise more convenient and advantageous for use, as will be hereinafter more fully set forth.

The novel features of my invention will hereinafter be denitely claimed.

In order that my invention may be the better understood, I will now proceed to describe the same with reference to the accompanying drawing, wherein:

Figure 1 is a vertical sectional view taken through a stove constructed in accordance with an embodiment of my invention, certain oi the parts being in elevation;

Figure 2 is a fragmentary detailed sectional view taken substantially on the line 2--2 of Figure 1.

In the drawing, C denotes a casing of required dimensions and conguration. This casing C has its lower end open and .its upper end closed by Casing C is preferably substan- I do not wish to be understood as limiting myself to this particular form. The side walls 2 of the casing C are provided with the air discharge openings 3 having disposed thereover downwardly facing louvers 4. The top plate I is also provided with the air outlet openings 5 over which are arranged the suitably directed louvers 8. 'I'he openings 3 and 5 with their associated louvers I and 6 serve to eiectively deflect or distribute the heated air passing out through such openings.

The walls 2 of the casing C in their lower portions are provided with the air induction openings 1 over each of which is disposed a downwardly and outwardly directed louver 8. These openings I further assure the desired flow of air upwardly within the casing C and around the sleeve member M which, in the present embodiment of the invention, is circular in cross section. This sleeve member M is formed of sheet metal and rests upon the spaced cross members 9 which extend across the lower open end of the casing C and are secured to opposed walls 2 thereof as indicated at I0.

This sleeve member M is of a height less than the height of the casing C and is also of a transverse diameter considerably less than the similar diameter of the casing C whereby is provided a space II surrounding the member M for the upward flow of air. The lower end of the member M is open and is defined by an outstanding flange I2 with which engage the hook bolts I t. These bolts i4 extend down through the cross members 9 and threaded upon the bolts and contacting from below with the members 9 are the holding nuts i5.

Resting upon the cross members 9 at the central part of the member M is a burner B of a well or pot type. 'Ihis burner B is preferably of cast iron and is provided in the upper portion of its side wall I 6 with the air inlet openings Il. In the present embodiment of the invention, the top of the burner B is provided with an outstanding surrounding ange I8 having close contact with the sleeve member M to assure an air space i9 surrounding the burner B so that air may pass upwardly of such space I9 and into the upper portion of the burner B through the openings Il for the proper support of combustion.

The casing C is provided with suitable supporting legs 2u for maintaining the casing C raised above the surface upon which it is supported so that air may readily pass up through th'e lower open end of the casing C into the spaces II and I9.

The lower portion of the burner B receives the fuel oil which is delivered thereto through the pipe line 2| leading from a suitable source of supply, and the sleeve member M at the upper portion thereof has in `communication therewith a flue F for carrying on? the products of combustion and, of course, creating the desired draft within the sleeve member M. The upper end of the sleeve member M is provided with a top plate 22 provided at its axial center with a large opening 23.

The burner B is provided-in its bottom wall 24 at the axial center thereof and also at the axial center of the opening 23 with an opening 25 of a diameter materially less than the diameter of the opening 23. This opening 25 is dei-ined by an upstanding sleeve 26 of a length to terminate above the normal fuel level within the burner B to prevent leakage of the fuel oil out through the opening 25.

Closely surrounding the sleeve 28 is the lower end portion of a tubular member 21. 'This member 21 may be readily slipped on or off oi the sleeve 26. The lower end portion of the member 21 is surrounded by an outstanding flange 28 to provide means whereby the member 21 may be effectively held to the bottom wall M of the burner B by the conventional bolt and nut fasteners as illustrated at 23. Interposed between the iianges 28 and the bottom wall 24 is a sealing gasket 30.

The member 21 is of a length to extend a predetermined distance above the top of the burner B. The upper end of this member 21 is open and said upper open end carries an outstanding surrounding spreader plate 3|. This plate 3| is preferably circular. in plan and extends a material distance beyond the member 21. This member 21, together with the spreader plate 3|, are of cast iron and of considerable thickness.

Resting from above upon the plate 3| and of a diameter substantially equal to the diameter of such plate 3l is a drum D, the wall of which is preferably of sheet metal readily conductive of heat. This drum D is open at its opposite ends and the lower end thereof is defined by an inwardly disposed ange 32 providing means whereby the drum D may be securely fastened to the peripheral portion of the plate 3| by the rivets 33 vor otherwise as may be preferred. It is found of advantage to interpose between the fiange 32 and the peripheral portion of the plate 3| a sealng gasket 34.

The upper open endof the drum D is defined by an outstanding ilange 35 and the drum D is of such length as to cause said flange 35 to closely approach from above the top plate 22 of the sleeve member M so that said upper portion of the drum may be secured to said top plate 22 by the usual bolt and nut fastenings, as indicatedvat 36. This flange 35 and the top plate 22 of the member M also have interposed there` between a sealing gasket 31.

ered in connection with the accompanying drawing, it will be readily apparent that I'have provided a hot air stove wherein the air as it passes up through the member 21 and into and up through the drum D is brought to a high temperature by the heat of the name of the burner so that said air as it passes out through the openings 3 and 5 will veffectively warm the room in which the stove is placed. Theflame of the burner is effectively spread by the plate v3| and during the operation of the stove the member 21, together with the plate 3|, are caused to become substantially red hot thus providing further means for assuring effective heating of the air passing up through the member 21.

It is believed to be obvious that the flow of the air into the burner B through the openings |1 and up through the burner will draw oil therewith vapor from the liquid fuel in the bottom of the burner with the result that the combustion will be within the upper portion of the burner B. The ame at the top of the burner will be effectively spread by the plate 3| which will result in a smooth flowing flame free of flicker and which flame passes upwardly beyond the periphery of the plate 3|. It is also to be stated that the bringing of the member 21 to a red heat will result in a more rapid vaporizaton of the fuel oil to assure a blue ame giving a uniform intense heat.

From the foregoing description it is'thought to be obvious that a hot air stove constructed in accordance with my invention is particularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated, and it will also be obvious that my in.

vention is susceptible of some change and modication without departing from the principles and spirit thereof and for this reason I do not wish to be understood as limiting myself to the precise arrangement and formationof the several parts herein shown in carrying out my in-l -vention in practice except as hereinafter claimed.v

I claim: l

l. A hot air stove of a liquid fuel burning type comprising a casing open at its bottom, a well type liquid fuel burner supported within the lower portion of the casing, a sleeve member within the casing surrounding and extending above the burner, the lower end of the sleeve being open, a flue in communication with the upper portion of the sleeve member and extending exterlorly of the casing, a top plate disposed over the sleeve member and having a large central opening, the burner having a bottom wall provided with an opening coaxial with the opening in the top plate of the sleevel member, a tubular member of cast iron extending from the opening in the bottom wall of the burner a predetermined distance above the burner, said tubular member being open atboth ends, a surrounding spreader plate also of cast iron carried bythe upper end portion of the tubular member, a drum mounted upon the spreader plate into which the tubular member discharges, said drum being of a diameter considerably in excess of the diameter of the tubular member, the upper portion of the drum closely fitting within the opening in the top plate of the sleeve member, the burner having a side Wall spaced from the adjacent lower portion of the sleeve, the upper part of the burner having an outstanding surrounding flange in contact with the sleeve, the side wall of the burner being provided therearound in its upper portion with air inlet openings.

2. A hot air stove of a liquid fuel burning type including a casing having an open bottom, means for supporting the casing above the oor, spaced bracing and supporting bars extending across the bottom of the casing, means for securing the bars to the casing, a sheet metal sleeve arranged within the casing, said sleeve open at its bottom and resting on the supporting bars, a flange carried by the lower end of the sleeve and extending laterally therefrom, means for securing the flange to the supporting bars, a top plate disposed over the sleeve and having a relatively large central opening, a flue in communication with the upper portion of the sleeve and extending through the casing, a well type liquid fuel burner positioned within the lower portion of the sleeve and resting upon the supporting bars, said burner having a bottom wall provided with a central opening, and an outwardly disposed surrounding flange carried by the upper part of the burner and contacting the inner wall of the sleeve, a cast iron tubular air duct extending up from the opening in the bottom wall of the burner to a point above the top of the burner, an outwardly disposed circular cast iron spreader plate carried by the upper end of the tubular air duct, the diameter of the spreader plate being substantially the'same as the flame discharge opening of the burner,

a sheet metal drum of a size to snugly slide through the opening in the top plate of the sleeve, both ends of the drum being open, the

bottom end. of the drum resting upon the spreader plate adjacent to its outer edge. an outwardly disposed ilange carried :by the upper end oi the drum and resting upon the outer face of the cover of the sleeve, an inwardly disposed flange carried by the lower end oi' the drum and resting on the spreader plate, and means for fastening the ilanges to ,the cover oi the sleeve and the spreader plate.

3. A hot air stove of a liquid fuel burning type including a casing having an open bottom, means for supporting the casing above the iioor. spaced parallel bracing and supporting bars extending across the bottom of the casing, means for securing the bars to the casing. a sheet metal sleeve arranged within the casing, said sleeve open at its bottom and resting on i the supporting bars, means for securing the sleeve to the supporting bars, a top plate disposed over the sleeve and having a relatively large central opening. a flue in communication with the upper portion o! the sleeve and extending through the casing. a well type liquid fuel burner positioned within the lower portion of the sleeve and resting upon the supporting bars. said burner having a bottom wall provided with a central opening positioned between the supporting bars and an outwardly disposed surrounding flange carried by the upper part of the burner and contacting the inner wall of the sleeve preventing lateral shifting of the burner uponl the supporting bars. a cast iron tubular air duct extending up from the opening in the bottom wall of the burner to a point above the top of the burner, an outwardly disposed circular cast ironispreaderplate carried by the upper end of the tubular air duct, a sheet metal drum of a` size to snugly slide through the opening in the top plate or the sleeve, both ends of the drum being open, the bottom end of the drum resting upon the spreader plate adjacent to its outer edge and means for fasteningl the drum tothe cover of the sleeve and the spreader plate.

BERNARD A. POLLOCK. 

